What PSI (pressure) are you running? - Page 4

spacewrangler · 09-24-2007, 08:16 AM

if you're running over 40 psi, how can you stand it on the road? i cann't keep the tires on the ground with 35 psi ...much less with 45 to 50!

i'm running 265/75/16 nittos in a d load range. ....even though is says you can put up to 60 psi ...that's too much for a runner or a tacoma. ...i took mine down to 30 psi for a month and they still wore evenly ...

i run them at 32 psi on the road. ..off road, 15 psi

This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!

skjos · 09-24-2007, 11:39 AM

32psi all around with 265/70/r17 BFGoodrich AT KO E-rated tires.

35psi is an abusive ride on an E-rated tire, 32psi is mucho better.

jjrgr21 · 09-24-2007, 01:01 PM

45 on 10 plys

keithguts · 09-24-2007, 01:13 PM

32psi in 31's

rearviewmirror · 09-24-2007, 01:57 PM

Running above the recommended seems to be the key to better fuel economy. A lot of sites like www.gassavers.org recommend running up to the maximum. I reckon I won't do that but I do around ~38PSI in my 4Runner these days, It's above the Toyota recommended pressure but well below the tire maximum. If it's good for 1-3MPG then that's huge because when you're running btw 15-18MPG then a 1-3 increase isn't bad.

Some light reading..

http://www.officer.com/article/artic...on=19&id=27281

http://www.gassavers.org/showthread.php?t=803

Quote:

Driving Under Pressure
Proper Tire Pressure Could Save Your Life

Posted: December 22nd, 2005 02:41 PM EDT
Courtesy Bobby Ore Motorsports

SGT. DAVE STORTON
EVOC Contributor
Officer.com

How many officers check the tire pressure on their patrol car on a regular basis? We all seem to be great at checking that the lights and siren work, because the time to find out they don’t work is not when you get a Code 3 call. Likewise, the time to find out your tire pressure is too low is not when you are in a pursuit and trying to take a corner at high speed.

What is proper pressure?

The proper tire pressure for the Police Crown Victoria is 44 psi. If you look on the sidewall of the tire, you will see that it lists 44 psi max pressure. Regardless of what vehicle you have, use the maximum pressure listed on the sidewall. Higher pressure results in better performance, decreased tire wear, and it lessens your chance of hydroplaning at a given speed. This number on the sidewall lists “the maximum amount of pressure you should ever put in the tire under normal driving conditions.” Pursuits and Code 3 responses are not “normal driving conditions.” Many agencies maintain tire pressure at 35 psi since this is what is listed in the owner’s manual and on the door placard. The reason the owner’s manual lists 35 psi is because we get the same manual as the civilian version of the Crown Victoria. The police version, however, is fully loaded with communications equipment, a cage, and your gear. You are not looking for a soft and cushy ride, you want performance.

Myths about pressure

Let’s put to rest some common misconceptions. The tires will not balloon out creating a peak in the center portion of the tread when tire pressure is above 35 psi. There is a steel belt that prevents this from happening. Also, you are not overstressing the tire with higher pressure, and the tire will not be forced off the rim with higher pressure. The picture above is Bobby Ore of Bobby Ore Motorsports driving a Ford Ranger on two wheels. The tires on the left side have 100 psi in them, and they happen to be tires and rims from a 1999 Crown Victoria! This is a dramatic example of how pressure holds the tire in shape, and how much stress a tire can handle.

Performance

If you were able to watch a tire as it travels across the ground at high speed, you would see that it deflects to one side during cornering. The faster you are going through a corner, the more tire deflection you get. As the tire deflects over onto the sidewall, you get less traction and more of a tendency to understeer or oversteer. This could spell disaster when negotiating a corner at high speed during a pursuit or a Code 3 run. Higher pressure keeps the tire from deflecting onto the sidewall as much, which keeps more of the treaded portion on the road.

A good demonstration for EVOC instructors is to have students drive a high-speed course in a vehicle with 32 to 35 psi. Then have them run the same course with 44 to 50 psi in the tires. The student will experience a marked difference in performance. Having officers experience this difference in vehicle performance is much more effective than just telling them to check their tire pressure.

Hydroplaning

When a tire rolls across a road covered with water, the tire tread channels water away so the rubber remains in contact with the road. The factors that affect hydroplaning are speed, and water depth. Conventional wisdom says that vehicles will hydroplane in as little as 1/16th of an inch of water. Not so coincidentally, legal tread depth is 1/16th of an inch.

Tire manufactures and the Association of Law Enforcement Emergency Response Trainers International (ALERT) have shown that tires have more of a tendency to hydroplane when pressure is low. This happens because the tire footprint (the portion of the tire actually in contact with the road) is larger. For those of you who water ski, think of which is easier to get up on: a fat ski or a skinny ski. More tire surface in contact with the water makes it easier to hydroplane, just as it is easier to water ski on a fat ski. Also, a soft tire can be pushed in more by the pressure of the water on the center portion of the tread. This results in less rubber in contact with the road.

Tire wear

Much better tire wear results from maintaining proper pressure. Tires with lower pressure will wear off the outside of the tread faster from the deflection of the tire during cornering, and the tires will heat up more from increased road friction. This is one of the factors that caused the failure of a certain brand of tires on Ford Explorers some years ago. In 1999 the San Jose Police Department realized a significant cost savings by increasing the pressure in the training fleet to 50 psi. They soon followed up by increasing the pressure in the patrol fleet to 44 psi. For liability reasons, most agencies are reluctant to exceed the maximum pressure listed on the tire for actual patrol vehicles, but they reap the cost saving when going to 50 psi on training vehicles.

Next time you inspect your vehicle, make sure you check your tire pressure since your ability to performance drive is significantly affected by it. You are not driving to the store to get a loaf of bread! You may be called upon to chase a dangerous criminal or respond to assist another officer in trouble. You don’t wonder whether or not your gun is loaded before you hit the street; don’t’ wonder whether your tire pressure is correct once the pursuit starts. Check your tires routinely, just as you do with all other critical equipment.

RunnerUp · 09-24-2007, 01:58 PM

30 on my 285/75/16 terragrapplers, decent gas mileage and nice ride... wear is even as can be

X-AWDriver · 09-24-2007, 02:46 PM

Quote:

Originally Posted by skjos

32psi all around with 265/70/r17 BFGoodrich AT KO E-rated tires.

35psi is an abusive ride on an E-rated tire, 32psi is mucho better.

E load on a 4Runner is kinda harsh period. My Nittos are D and at anything over 35psi they start to get harsh.

skjos · 09-25-2007, 11:34 AM

The E-rated tires were snuck on by the guys at Discount Tire, I didn't notice that they were E-rated until a buddie pointed it out much later.

I figured the new harshness in the ride was due to the lift I put on at the same time. After airing down to 32psi, the ride is now pretty good.

I've learned lesson; not only do you need to specify the brand and size, you also need to include the load rating.

My new rims are rated for 2,150, its a good thing my tires will handle 3,195. When my rims crumble at least my tires will still be good. =)

X-AWDriver · 09-25-2007, 12:09 PM

Yep,when you look up TGs on the Discount site it automatically brings up the E load rated version and you actually have to look at the subset of Nittos to find the D load rated which there was also a considerable price diff too.

Jay351 · 09-09-2008, 03:16 PM

35psi for the road - Was running 40 but my tires didnt like it much.

Tacoclimber · 09-09-2008, 03:45 PM

35 psi for mine. (285/75R16 BFG TA's.)

BigO · 09-09-2008, 05:36 PM

I was running my BFG M/T completly flat until a few weeks ago when Obama told me to air them up. I now run them at ~32psi, and I am getting much better gas mileage now!

Thanks Mr. Obama!

ryantowry_81 · 09-16-2008, 11:33 PM

i run 4 on the trail and like 15 on the street, but i run 39.5x15 TSL bias so they are pretty stiff and it only sees the street once in a blue moon.

thisisnttomwyatt · 10-15-2008, 07:54 PM

36 tsls at 10psi

racermp · 10-16-2008, 11:55 AM

30, my ride gets bouncy on the freeway if it's over 30.

xcmountain80 · 10-16-2008, 04:35 PM

40 PSI with my 295 Nitto Terra's

Aaron

**Yoda** · 10-16-2008, 06:31 PM

105 PSI on the company Firetruck

poorboyota26 · 11-13-2008, 10:01 AM

40psi on average 31 bfg AT's I get 2mpg better when I run 45 on the highway. I run 10-12 psi on the trail.

Vanman · 12-04-2008, 10:15 AM

My tires call for a max of 50psi, so I usually run them at 45-47. I don't check them too often, but they seem to hold pretty well. Usually only have to add air every 4-5 months (that's how often I check the tires, WOW! That sounded bad...)

Squeebs · 12-15-2008, 12:59 AM

40 in the front, 36 rear

Why are you guys running less air in the front? Thats where all the weight is...

xcmountain80 · 12-15-2008, 07:10 PM

Oh oh 45psi and with awesome fuel economy results. Yeah!

Aaron.

99SR5 · 01-01-2009, 01:27 PM

Quote:

Originally Posted by Adam F

stock tires, 32psi as per door jamb sticker

yep. always suppose to run what it says on the door

rowdy235 · 01-01-2009, 04:46 PM

34psi Kingstar Radial H714's 185/65/14

toyota-erik · 01-01-2009, 05:11 PM

8 psi front/7psi rear

xcmountain80 · 01-01-2009, 08:57 PM

Quote:

Originally Posted by 99SR5

yep. always suppose to run what it says on the door

Unless your door jam stickers don't match your tires!

Aaron

09-24-2007, 11:39 AM	#77 (permalink)
skjos Registered User Join Date: Jun 2007 Location: Orting, WA Posts: 305	32psi all around with 265/70/r17 BFGoodrich AT KO E-rated tires. 35psi is an abusive ride on an E-rated tire, 32psi is mucho better. __________________ 2002 4runner SR5 4x4 1994 Ext Cab Truck 4x4 (22R-E)

09-24-2007, 01:01 PM	#78 (permalink)
jjrgr21 Registered User Join Date: Aug 2006 Location: Maryland Posts: 1,520	45 on 10 plys __________________ 2003 4WD TRD Tacoma 1986 4Runner

09-24-2007, 01:13 PM	#79 (permalink)
keithguts Registered User Join Date: Aug 2006 Location: Bay Shore, NY Posts: 1,422	32psi in 31's __________________ IF YOU DON'T DRIVE A TOYOTA, TEST DRIVE ONE TODAY! MY PICS 95 4runner 3.0 auto 4x4 My Rig My Rig RangerMan Enjoy

09-24-2007, 01:58 PM	#81 (permalink)
RunnerUp Registered User Join Date: Jul 2005 Location: Tampa, Florida Posts: 1,020	30 on my 285/75/16 terragrapplers, decent gas mileage and nice ride... wear is even as can be __________________ Kyle 2002 4Runner - Lifted/Locked/Armored/Charged - 145k Miles 2007 4Runner V8 Sport Edition 4WD 20k Miles Buy My Stuff!!! http://www.yotatech.com/f109/97-4run...rt-out-151470/

09-25-2007, 11:34 AM	#83 (permalink)
skjos Registered User Join Date: Jun 2007 Location: Orting, WA Posts: 305	The E-rated tires were snuck on by the guys at Discount Tire, I didn't notice that they were E-rated until a buddie pointed it out much later. I figured the new harshness in the ride was due to the lift I put on at the same time. After airing down to 32psi, the ride is now pretty good. I've learned lesson; not only do you need to specify the brand and size, you also need to include the load rating. My new rims are rated for 2,150, its a good thing my tires will handle 3,195. When my rims crumble at least my tires will still be good. =) __________________ 2002 4runner SR5 4x4 1994 Ext Cab Truck 4x4 (22R-E)

09-25-2007, 12:09 PM	#84 (permalink)
X-AWDriver Contributing Member Join Date: Sep 2003 Location: Littleton,CO Posts: 10,176	Yep,when you look up TGs on the Discount site it automatically brings up the E load rated version and you actually have to look at the subset of Nittos to find the D load rated which there was also a considerable price diff too. __________________ '99 4Runner Highlander 4wd E-locker,rear diff and deckplate mod * 265/75/16 Nitto TerraGrapplers * Yakima Load Warrior rack * clear corners/signals * Tacoma skidplate * Silverstar lamps/fogs Alpine CDA-9831,Bazooka EL Series 250w amp,MTX 10" sub

09-09-2008, 03:16 PM	#85 (permalink)
Jay351 Contributing Member Join Date: Feb 2007 Location: maple ridge, British Columbia, Canada Posts: 8,640	35psi for the road - Was running 40 but my tires didnt like it much. __________________ 91 Pickup - xcab - 5sp - 3.0 - SR5 - 4x4 - 250k \|2.25" catback w/ magnaflow cat + glasspack \| Weasy2k cams \| Aisin manual hubs \| Diff breather mod\| Marlin HD clutch \|3" BL \| es3000's \|2" AAL \|1.5" bj spacers \| ISR \| Alpine headunit \| 4" Infinity fronts/5" rears \| 4.88's \|Rear lockright \| 33x12.50" BFG M/T on 15x8" steelies \|Hella 500's \|4" reverse lights\| Grant GT \|idler arm brace\|hella E-codes\| Marlin armor \|SS IFS brace \| %100 Amsoil synthetic http://www.cardomain.com/ride/2572486

09-09-2008, 03:45 PM	#86 (permalink)
Tacoclimber Contributing Member Join Date: Dec 2003 Location: Between a rock and a hard place, AZ Posts: 3,713	35 psi for mine. (285/75R16 BFG TA's.) __________________ CJ ...<>< 03 DC TRD Tacoma 4wd with a bunch of junk. SOLD 1964 Chevy Biscayne, 230 I6, lowered, satin black, old-school legit. Just wheel the stupid thing!!! But do it responsibly, ok? My band: Road Worn Saints

09-09-2008, 05:36 PM	#87 (permalink)
BigO Registered User Join Date: Jul 2007 Location: Georgia Posts: 40	I was running my BFG M/T completly flat until a few weeks ago when Obama told me to air them up. I now run them at ~32psi, and I am getting much better gas mileage now! Thanks Mr. Obama! __________________ 1985 4x4 Extended Cab, 22RE, E-locked rear, 4.7 MC Gears

09-16-2008, 11:33 PM	#88 (permalink)
ryantowry_81 Registered User Join Date: Aug 2008 Location: Anchorage, AK Posts: 422	i run 4 on the trail and like 15 on the street, but i run 39.5x15 TSL bias so they are pretty stiff and it only sees the street once in a blue moon. __________________ the "Turtle": now the mutant turtle..... 84 ex cab 63" chevies Rears Up Front Square Drive Shaft d60f 14 bolt rear welded both with 5.38's home brew hi steer 42x15-15 TSL's TBI 4.3 V-6 pretty much stock!!! Denali offroad club: http://www.denalioffroadclub.com/for...orum/index.php

10-15-2008, 07:54 PM	#89 (permalink)
thisisnttomwyatt Registered User Join Date: Nov 2007 Location: south of boston Posts: 11	36 tsls at 10psi

10-16-2008, 11:55 AM	#90 (permalink)
racermp Registered User Join Date: Sep 2008 Posts: 69	30, my ride gets bouncy on the freeway if it's over 30. __________________ 96 4Runner SR5 2WD Auto

10-16-2008, 04:35 PM	#91 (permalink)
xcmountain80 Registered User Join Date: Jul 2004 Location: Jupiter, FL Posts: 1,880	40 PSI with my 295 Nitto Terra's Aaron

10-16-2008, 06:31 PM	#92 (permalink)
Yoda Super Moderator Staff Join Date: May 2002 Location: North Bend, WA Posts: 2,664	105 PSI on the company Firetruck __________________ David TLCA 14788 71 Landcruiser FJ-40 TBI 327, TH-350, Warn 8000, disk axle swap. 76 Landcruiser FJ-40 project/parts (haven't decided)

11-13-2008, 10:01 AM	#93 (permalink)
poorboyota26 Registered User Join Date: Feb 2007 Location: Greeley, CO under duress Posts: 73	40psi on average 31 bfg AT's I get 2mpg better when I run 45 on the highway. I run 10-12 psi on the trail. __________________ 86 4Runner rebuilt 22re, Engnblder street/rv head, crawler cam, KB pistons, R151F It has this pocket in it where I put money in but I just can't seem to get it back out !!!!

12-15-2008, 12:59 AM	#95 (permalink)
Squeebs Registered User Join Date: Jul 2007 Location: Bakersfield Posts: 523	40 in the front, 36 rear Why are you guys running less air in the front? Thats where all the weight is... __________________ "Battle Wagon" 1992 Extended Cab, 3.0 with KN intake, black steelies, procomp xtreme all terrains, XM radio, kicker 12" sub, cobra 25ltd CB- R.I.P. 09-09-09 New Baby: 1994 Extended Cab, 22re, AC, Cruise, ProComp Extreme All-Terrains, stock radio, 4-Runner Buckets, Manual Hub Conversion. NEW WORK IN PROGRESS!!!

12-04-2008, 10:15 AM	#94 (permalink)
Vanman Registered User Join Date: Feb 2008 Posts: 86	My tires call for a max of 50psi, so I usually run them at 45-47. I don't check them too often, but they seem to hold pretty well. Usually only have to add air every 4-5 months (that's how often I check the tires, WOW! That sounded bad...) __________________ 1991 4Runner SR5 V6

12-15-2008, 07:10 PM	#96 (permalink)
xcmountain80 Registered User Join Date: Jul 2004 Location: Jupiter, FL Posts: 1,880	Oh oh 45psi and with awesome fuel economy results. Yeah! Aaron.

01-01-2009, 04:46 PM	#98 (permalink)
rowdy235 Registered User Join Date: Sep 2007 Location: Sweet Home, OR Posts: 1,562	34psi Kingstar Radial H714's 185/65/14 __________________ The Daily Driver: 1998 Tacoma \| Regular Cab \| 4WD \| 2.7L \| 5-Speed Stick \| Mostly Stock The People-Hauler 1988 Grand Wagoneer \| SUV \| 4WD \| AMC 360 \| 3-Speed Auto \| All Stock The Dump Runner 1982 Pickup \| Regular Cab \| 2WD \| 22R \| 5-Speed Stick \| Custom Exhaust FER SALE! http://www.yotatech.com/f108/1982-sh.../#post51229916

01-01-2009, 05:11 PM	#99 (permalink)
toyota-erik Registered User Join Date: Jul 2008 Location: M/V Midland & Biwabik MN Posts: 175	8 psi front/7psi rear __________________ 81 Toyota P/U, 22R with GotPropane kit, wheelbase stretched 5", bobbed box, narrowed tube frame from cab back, full exo, tube doors, Warn 9000i, 36" IROKs,TR bead locks, 4 link front, 3 link rear, Fox 2.0 16" all around. Rear axle is shaved, trussed, V6 3rd, CroMo axles, 4.88, full spool, and disc brakes. Front axle is trussed, HP 3rd, 4.88, 30spline Longfields, and a lunchbox locker. Full hydro Howe desert series race pump(reworked by PSC), CroMo steering arms, 4.7:1 t-case

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
3.4 oil pressure not reading??? Running hot	fillsrunner4	3.4 Swaps	21	04-12-2008 01:00 PM
Low Oil pressure? and running on 5 cylinders?	1992toyota4x4	86-95 Trucks & 4Runners	5	02-28-2008 08:44 PM
kumho Road Venture MT KL71. Anybody running these??	nicka	Tires & Wheels	20	11-04-2006 06:51 AM
What PSI in you running in your tires??	Bigkahuna808	Tires & Wheels	24	06-06-2004 03:44 AM